GEO
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Created by:
melissaheil89 Plus on May 6, 2010
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22 terms
Terms | Definitions |
|---|---|
 regolith | all the materials lying between unweathered rock below and the Earth's surface above. |
| tangential component | gravitational force that tends to pull the boulder down the slanted surface. Greater at 50 degree |
| normal component | the part of the gravitational force that tends to hold a boulder on the inclined surface. Greater at 40 Degree |
| landslide | downward and outward movement of slopeforming materials composed of natural rock, soils, artificial fills or combinations of these materials. |
| rock | any hard intact firm mass that existed in its natural plcae pror to the landslide |
| soil | agrfrefate of minerals and rock fragments plus or minus organic material that formed from the weathering of rock. pores filled with gases or water |
| earth | 80% smaller 2mm |
| mud | 80% smaller than .06mm |
| debris | 20-80% larger than 2mm |
| complex landslide | commonly involves two or more of classes |
| rock falls | solid material or soil become detached from a steep slope and then fall freely |
| topples | rock falls that involve the forward rotation of a detached black above a pivotal point located where material detached |
| slides | coherent mass of regolith or bedrock breaks free then slides down slope planar or curved surface |
| translational | landmass slides along a relatively planar surface - joints or beddings |
| block slump | translational detached landmass consists of a few or single closely related units that move down coherent |
| Rotational | coherent mass of regoltih breaks free form a slope along a curved slip surface |
| Lateral Spreads | Occur on very gentle or flat slopes. Failure occurs as a result of liquefaction |
| Earthflows | Water saturated fine grainde slope material that liquefies and then runs out - bowl shaped depression .17-.20 kil per hour - greater water = faster |
| DEbris Flows | following intesnse rainfall - water saturated and unstable and give away. wet cement - 56 kil per our |
| Mudflows | Slopes covered by water saturated soils or fine grained sedimentary deposits - intesnse rainfall causes liquefied resulting in mudflow slitsize fast |
| Creep | slow and steady down slope movement of regolith |
| Solifluction | permafrosti s soil that remains frozen for at least two consecutive years. the ayer that moves is slow motion down slope |
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